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you need do :
1) make sure the speaker system works ok,
please reference here to make sure your speaker connection.http://support.dell.com/support/edocs/acc/hk195/Notes.htm
power on then touch the male jack by your finger, heard noise which is works well then go next
2) to make sure whats the PC speaker outlet hole, then put the male jack to your PC.
hope help you do it well.

This excerpt on page 17 can be clarified by adding "IF," before the sentence.

"NOTE: Speakers may be passive (no power button and no power cord) or active (power button or power cord). Your computer supports only active (powered) speaker systems; the speaker system must have its own power cord."

This is an excerpt from page 21

"Speaker types

Speakers may be included with the monitor (select models only) or are sold separately. Refer to the product documentation for your speakers.Your computer supports only an active (powered) speaker system. An active speaker system must have its own power cord. A home audio system does not require active speakers, because the receiver provides amplification."

Generally speaking, manufacturers offer many types of speakers for use with their computers. If the speakers that originally came with your computer had a extrernal power supply, then it would probably be best to use externally powered speakers.

I have seen many older computers and even some budget computers that use the sound card for amplification. Most modern sound cards are primarilly focused on sound processing, and not necessarilly amplification.

Its impossible to know whether your system requires powered or non-powered speakers because I have no way of knowing your computers specific configuration. However, I think it is safe to say, if you use externally powered speakers in either case, you should be ok.

If you call the manufacturer, or go to its web site, your original computer configuration can normally be provided if you provide its serial number.

Ok... first off... the Harmon/Kardon isn't the model for the Laptop.... it's the type of speakers you have... Great sound for a laptop... but still that refers to the speakers... people have problems with these things... I had to trouble shoot this all the time at my high school... Try going into the display properties and trying to add it as another monitor... (this may even work better for you then having to use the one screen)...

For the speakers, you need only connect to the GREEN jack at the back of your computer. It's OK to leave the others blank.

Your two HK speakers will, with one wire, connect to each other and, w/ another wire (usually having a GREEN connector on the end), connect to the computer.

I'm not sure what the 3rd wire is unless it's (1) the power connector or (2) for connecting to a sub-woofer.

Does the speaker set include a sub-woofer? Or does it include a "surround sound" or 3rd speaker?

You can find pics & symbols (the symbols are helpful if your sound card jacks are not color-coded) for (3) of the most common audio connections HERE.

Usually the color of the connector on the wire is matched to the sound card jack w/ the same color. (green to green; pink to pink; blue to blue).

green = speakerspink = micblue = line in

Make sure you are connecting to the active sound connectors - the ones you used b4 the HK speakers.

If you have "integrated audio" (audio that is built into the motherboard) and you have an audio expansion card installed on the computer as well, one may be disabled or not selected in your computer's audio configuration.

If that's the case (that you have two sets of audio jacks to choose from), try connecting the speaker wire from the HK speakers 1st to the green jack (or the jack marked w/ the symbol of a speaker) at the bottom of your computer. (There'll only audio jacks here if there is an audio expansion card installed on your computer.)

If that is the case, there'll be other (usually) colored jacks running horizontally next to the speakers jack.

If you still have no sound, connect the speaker wire to the GREEN jack that is (usually on Dells) up by your PS2 (round - one purple and one green) keyboard and mouse connectors (also at the back of your computer). The other jacks in that set (of audio jacks) will be situated vertical to one another and on the left-most side at the back of your computer.

Please, let us know if this response was helpful for you or, of course, if you have any further questions.